Cross cutting assemblage for use in cutting paper,cardboard and similar materials



Nov. 1 1. 1969 H 6 R ET AL 3,477,328

CROSS CUTTING ASSEMBLAGE FOR USE cu NG PAPER, CARDBOARD AND SIMILAR M RI Filed Jan. 23, 1967 2 Sheets-Sheet 1 Fig. 7 Fig. 3

NOV. 11. 1969 G ME ET AL 3,477,328

CROSS CUTTING ASSEMBLAGE FUR USE IN CUTTING PAPER, CARDBOARD AND SIMILAR MATERIALS Filed Jan. 23, 1967 2 Sheets-Sheet 2 Fig.

United States Patent 3,477,328 CROSS CUTTING ASSEMBLAGE FOR USE IN CUTTING PAPER, CARDBOARD AND SIMI- LAR MATERIALS Herbert Schonmeier, Dusseidorf-Benrath, and Horst Mohle, Hilden, Germany, assignors to Jagenberg- Werke AG, Dusseldorf, Germany Filed Jan. 23, 1967, Ser. No. 611,002 Claims priority, application Germany, Feb. 2, 1966, J 29,964; Dec. 7, 1966, J 32,428 Int. Cl. 326d 1/12 US. Cl. 83-677 11 Claims ABSTRACT UP THE DISCLOSURE The invention relates to a cross cutter for cutting moving webs of paper, cardboard and similar material, and more particularly to a cross cutter having a cutter block or head provided with two or more knives.

Cross cutters have cutter blocks or heads on which two knives are mounted are efficacious in that such cutters enable the removal of one knife from its operative position. It is already shown in the prior art to provide cutter blocks or heads for this purpose in which the movable knife is movable out of and into operative positions respectively, by means of a radial shifting thereof. In such a situation, there are needed, in addition to a guide, and a bearing respectively for the knife to be shifted, movement control means, such as levers, bell cranks, crankshafts, toothed racks or the like and which control means not only constitutes a relatively high cost factor but due to the complex nature thereof result in an unavoidable play of movement. Such play of movement does not offer any assurance for an accurate parallel shifting or displacement of the knife nor for a precise end position and secure fastening of the knife. This, of course, is of great importance for a trouble-free co-action with the counter knife and for obtaining a clean cut.

An object of this invention is to provide a cutter block or head particularly for use with rotatable cross or transverse cutters in which the block or head is equipped with a knife adapted to be moved from an inoperative position to a projected or operative position and which movement of the knife may be effected by simple structural means with the adjusted position of the knife being properly retained.

A further object of the invention is to provide an effective and easily operable mounting for the knife.

According to the present invention the problem has been solved by designing one or more of the knives positioned on the circumference of the cutter block or head in such a fashion that by longitudinal shifting, the knife or knives can be moved into and out of the cutting position thereof and in which a preferred embodiment provides that the longitudinally shiftable or displaceable knife or its support is of wedge shape and guided and mounted relative to a surface of the block or head which is inclined with respect to the cutting edge of a knife. The longitudinally shiftable support is made in the form of a section of "ice a cylinder having its separating face being inclined relative to the axis of the block or head.

The mounting of the knife or of the knife support on the block or head is accomplished by a plurality of tension bolts which develop the clamping force required by spring means with such clamping force being removable by an axial shifting or displacing of all of the tension bolts in unison. Another aspect of the invention which particularly facilitates the manipulation of the knife mounting resides in that the axial shifting which suspends the clamping force of the tension bolts is realized by mechanical and/or hydraulic means functioning simultaneously for all of the tension bolts.

In a preferred embodiment of the invention, the desired results are obtained by reason of the fact that the spring-loaded tension bolts include cylinder or piston means stressed by pressure means connected to a common pressure developing means. The advantage of the above arrangement resides in the fact that it is possible to axially shift or displace simultaneously all bolts and as result of which the clamping force in the total mounting zone can be removed so that shifting or displacing of the knife can occur. Moreover, the arrangement can be such that a pressure generating means constitutes a part of the body of the cutter block or head or is connected to a conduit for supplying pressure means to all of the tension bolts. An important advantage of producing the clamping force by springs as against a direct production of the clamping force by a pressure medium resides in the maintenance of the clamping force effected by the spring means, whereas in the production and maintenance of such force by a pressure medium there is the possibility of a pressure loss and as a consequence, an accidental loosening thereof.

A further possibility for providing for the axial shifting or displacing of all of the tension bolts by virtue of release of the clamping force is directed to the concept of associating with each tension bolt a mechanical actuating means for effecting such axial shifting and such actuating means constitute components of a common kinematic chain. Such actuating means can be, for example, wedges, levers or cams and which actuating means are interconnected via actuating linkage means.

To assure an accurate parallel shifting or displacement of the knife support with respect to the cutter block or head, the surfaces of these two components which touch or abut one another are provided with cooperating guide means. With respect to a longitudinal shifting or displacing of the knife support, there is provided a screw spindle rotatably mounted in the block or head with such spindle not mountable for axial shifting and which spindle engages a nut fixedly connected to the knife support. The cutting position determined by the terminal position of the knife support is fixed by a stationary lug or stop which, if desired, can also be adjustable in order to obtain a precise or exact setting.

Further important objects and advantages of the invention will become more readily apparent from the following detailed specification and annexed drawings and in which drawings:

FIGURE 1 is a diagrammatic view partly in vertical cross section and partly in elevation of a cross cutter according to the present invention.

FIGURE 2 is a view partly in elevation and partly in section of the front of the cutter block or head with the knife in its operating position.

FIGURE 3 is a fragmentary view partly in elevation and partly in cross section of the front of a cutter block in which the knife is located in its inoperative position.

FIGURE 4 is a view taken along the line 4-4 of FIG- URE 2, the view looking in the direction of the arrows, and

FIGURES -9 respectively disclose views partly in cross section and partly in elevation of various embodiments and actuating means for the tension bolts.

Referring to the drawings and more particularly to FIGURE 1, it will be noted that the cutting assemblage includes a cutter block or head 1 capable of rotation in the direction denoted by the arrow and which head is provided with diametrically opposed knives 2 and 3. The knife 2 is fixedly mounted in the block or head 1, whereas the knife 3 is movably mounted in such head. The knives 2 and 3 rotating with the block or head 1 cooperate with a fixed or stationary counter knife 4 so that a paper web 5 supplied from a roll (not shown) is separated into individual sheets 6 which by means of endless conveying means, such as belts 7 and 8, are fed to a stack or further processing station (not illustrated).

Referring to FIGURES 2 and 4, it will be noted that the block or head 1 consists of a longitudinally extending hollow body of substantially cylindrical shape and on the circumference of which there are formed diametrically opposed grooves 9 and 10 for receiving the knives 3 and 2 respectively, and which knives are mounted in a known fashion by Wedges and screws (not shown). The knife 3 is mounted on a support 11 which constitutes a part of the block or head 1 and the support 11 is a part of a section of the block or head 1 with separating face 12 thereof being inclined or at an angle relative to the axis of rotation of the block or head. Upon the separating face 12, there is guided the support 11 and which support can be shifted or displaced longitudinally with a shifting to the left (FIGURE 3) bodily moving the knife 3 from the cutting position and a shifting to the right bodily moving the knife 3 into cutting position. The separating face 12 bounds mounting flanges 13 and 14 which are provided with bores 15 and slots 16 for receiving tension bolts 17. In order to ensure an accurate parallel shifting or displacing, the face 12 is provided with a tongue and groove guide track 18 cooperably related between the flanges 13 and 14.

With reference to FIGURE 5, it will be seen that the embodiment illustrated therein includes a tension bolt 17 which clamps the flanges 13 and 14 together, with such bolt being in the form of a cylinder 19 at one end thereof which encloses a piston 20 and the bolt 17 slides in a bore formed in the piston 20. Operatively related to the opposite or other end of bolt 17 is a collar 21 against which one end of cup-like spring 22 bears, while the opposite end of such spring bears against the flange 13. In this embodiment the bolt 17 is in the clamping position, or in other words, the spring 22 exert the necessary or required clamping force. Upon the introduction of compressed air or a pressure fluid into a conduit 23 and which conduit is connected to a suitable pressure generating means (not shown) the tension bolt 17 is subjected to an axial downward movement thereby with a further tensioning of the spring 22, the clamping force between the flanges 13 and 14 is rendered ineffective and a longitudinal shifting of the knife support 11 can be effected.

In the embodiment disclosed in FIGURE 6 it will be appreciated that there is basically a reversal of the structure shown in FIGURE 5. More particularly, one end of the tension bolt 17 is in the form of a piston 24 which is movable in a cylinder 25 secured to the flange 13. The springs 22 are located between the face of the piston 24 and the flange 13 and with an introduction of pressure medium to the conduit 23, the bolt 17 is displaced downwardly with a further compression of the springs 22 and with a removal of the clamping force.

FIGURES 7 and 8 disclose further forms for a mechanical actuation of the tension bolts 17 in such a fashion that either wedges 26, as shown in FIGURE 7, or toggle levers 27, as shown in FIGURE 8, effect the actual shifting or displacing of the bolt 17 and as a consequence, the removal of the clamping force. In order to provide for a common actuation of all of the tension bolts 17 in .4 unison, it will be noted that in FIGURE 7 there is provided a linkage 28 and in FIGURE 8, a linkage 29 which connects the wedges 26 and toggle levers 27 respectively with one another.

With regard to FIGURE 9, it will be appreciated that in this embodiment the axial shifting or displacing of the bolt 17 is achieved by a wedge 26 which is movable in a complementary shaped groove or slot 30 formed in the bolt 17. Starting from the tensioned position illustrated in FIGURE 9, the axial shifting of the wedge 26 toward the left relieves tension from the springs 22 and thus removes the clamping action of the tension bolt 17.

The longitudinal shifting of the face of the knife support 11 and as a consequence, the knife 3 is achieved by a screw spindle 31 (FIGURE 2) which is not shiftable in the axial direction but which is rotatable in a bearing 32 provided on the block or head 1. The opposite or other end of the spindle 31 engages a nut 33 fixedly mounted on the support 11. The spindle 31 can be rotated by means of a suitable tool, such as a hand-wheel or crank (not shown) which can be attached to the free end of the spindle 31. On the base of the block of head 1 at the end opposite to the end carrying the spindle 31, there is provided a fixed stop 34 which limits the longitudinal shifting of the knife support 11 and as a consequence, determines the operating position of the knife 3.

It is therefore clear that the present invention provides a rotary cross cutting assembly for cutting moving webs of paper, cardboard or like material in which a rotary knife-carrying head or drum means cooperates with a stationary knife means in effecting transverse cuts. The rotary head means includes at least two parts 1 and 11. A knife means 3 is carried by and extends longitudinally of one of the parts 11. Maens are provided for mounting the parts for relative movement with respect to each other including cooperating guide and supporting surfaces defined by the facing surfaces of flanges 13 and 14. As shown, these surfaces extend transverse to the axis of rotation of the rotary head means, FIGURE 4. These surfaces are so related to the axis of rotation of the head means that in any plane perpendicular to and passing through the knife means 3 and the axis of rotation, the imaginary lines containing said surfaces appearing in such plane, as indicated by separating face or line 12, cross the imaginary line on such plane passing through the cutting edge of said knife means and said axis so that relative movement between said parts imparts a compound movement to said knife means between an operative cutting position at a particular radial distance from said axis and an inoperative position at a lesser distance from said axis, see FIGURE 3. The screw spindle 31 and nut means 33 carried by the parts constitute means for effecting such relative movement between the parts and the various tension bolt arrangements constitute the means for releaseably holding said parts together to hold said knife means at the respective operative and inoperative positions.

What is claimed is:

1, In a cross cutting assemblage for use in cutting moving webs of paper, cardboard and like materials, a rotatable head means, at least one knife for said head means adapted to cut the web upon rotation of said head means when the edge of said knife lies at a particular radial distance from the axis of said head means, mounting means supporting said one knife on the head means for movement from an inoperative position inwardly of said radial distance to an operative position to lie at said radial distance and means operably related to said mounting means for longitudinally shifting said mounting means for bodily longitudinally moving said one knife to said positions.

2. The cross cutting assemblage as claimed in claim 1, in which said mounting means is wedge-shaped, and said head means includes a surface inclined relative to its axis and to the cutting edge of said one knife for guiding said mounting means.

3. The cross cutting assemblage as claimed in claim 2 in which said mounting means includes a portion defined by an arcuate section of a cylinder, oppositely extending flanges projecting from said portion and defining separating surfaces and said flanges being inclined relative to the axis of said head means.

4. In a cross cutting assemblage for use in cutting moving webs of paper, cardboard and like materials, a rotatable head, at least one knife for said head adapted to cut the web upon rotation of said head, means for mounting said one knife on the head for movement from an inoperative position within said head to an operative position projecting beyond the periphery of said head, means operably related to said mounting means for longitudinally shifting said mounting means for moving said one knife to said positions, said mounting means including a plurality of tension bolts, spring means operably related to each bolt for developing a clamping force and means operable simultaneously on said tension bolts for effecting an axial shifting of said bolts for relieving said clamping force.

5. The cross cutting assemblage as claimed in claim 4 in which each tension bolt is defined by a cylinder-piston means subjected to hydraulic pressure.

-6. The cross cutting assemblage as claimed in claim 4 which the means operable simultaneously on said tension bolts comprise mechanical actuating means for each bolt constituting a common kinematic link-age for all said bolts adapted to axially shift said bolts for relieving said clamping force.

7. The cross cutting assemblage as claimed in claim 1 in which said head and said mounting means include surfaces in contact with each other and guide means cooperably related between said surfaces and extending longitudinally of said surfaces in a plane parallel to the axis of said head means for constraining said mounting means to shift in a direction that is longitudinally of said head.

8. The cross cutting assemblage as claimed in claim 1, in which said means for longitudinally shifting said mounting means includes a threaded spindle rotatable but not axially movable mounted in said head means.

9. The cutting assemblage as claimed in claim 1, including stop means carried by said head means and cooperable with said mounting means for determining the operating position of said mounting means.

10. In a rotary cross cutting assembly for cutting moving webs of paper, card-board or like material, a rotary head means including at least two parts, a knife means carried by and extending longitudinally of one of said parts, means mounting said parts for relative movement with respect to each other including cooperating guide and supporting surfaces extending transverse to the axis of rotation of said head means and so related to said axis that in any plane perpendicular to and passing through said knife means and said axis, the lines of said surfaces in said plane cross the line in such plane passing through the cutting edge of said knife means and said axis so that relative movement between said parts imparts a compound movement to said knife means between an operative cutting position at a particular radial distance from said axis and an inoperative position at a lesser distance from said axis, means for eflfecting such relative movement between said parts and means for releaseably holding said parts together to hold said knife means at said positions.

11. A rotary cross cutting assembly as claimed in claim 10 and said surf-aces extending at an angle to the axis of rotation and said relative movement comprising displacement of one part relative to the other longitudinally of said axis.

References Cited UNITED STATES PATENTS 565,186 8/1896 Taylor 83-671 2,660,242 11/1953 Lane 83-677 ANDREW R. J UHASZ, Primary Examiner J. F. COAN, Assistant Examiner us. or. x11, 3- 09 

